ACI Written Exam Questions and Answers | Verified & Updated 2024

ACI Written Exam Questions and Answers | Verified & Updated 2024 The sensor of the temperature measureing device shall be submerged a minimum of ____ in - Answer ️️ -3 (75mm) The temperature measureing device shall have a capacity of measuring temperature of freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - Answer ️️ -1(.5 degrees C), 30-120 (0-50 degrees C) The temperature measuring device shall be calibrated____, or whenever there is a question of _____ - Answer ️️ -annually, accuracy The temp of concrete may be measured in a wheelbarrow - Answer ️️ -true the temp of concrete may be measured in a wall form - Answer ️️ -true A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temp. - Answer ️️ -false What must be done to the sample container prior to sampling the concrete - Answer ️️ - dampen (with water) what must be done to the concrete surrounding the temp measuring device after the device has submerged - Answer ️️ -Press concrete around measuring device How long must the temp device remain in the concrete - Answer ️️ -at least 2 minutes (but no more than 5) After temp of concrete is read, what then is required - Answer ️️ -reporting of temp the temp of concrete to be measured to the nearest ____degree F - Answer ️️ -1 (.5 degree C) According to the ASTM C1064 what is one reason to take the temp of concrete - Answer ️️ - verify conformance to a specified requirement for temp A max temp of concrete is specified in ASTM C1064 - Answer ️️ -False The sample of concrete used for temp determination must be rodded 25 times - Answer ️️ - False Sampling by this method is required when tests are to be made to determine ____ with specification requirements - Answer ️️ -compliance The method covers sampling from four types of mixers which are _____, _____, ____, and _______ - Answer ️️ -stationary mixes, paving mixers, revolving drum mixers and open top mixers The maximum allowable time between obtaining the first and final portions of a composite sample is ______ minutes - Answer ️️ -15 Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample - Answer ️️ -True The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temp, and air content is ______ minutes - Answer ️️ -5 the molding of strength test specimens shall begin within ____ minutes after fabricating the composite sample - Answer ️️ -15 The concrete sample must be protected from contamination and ____ - Answer ️️ -rapid evaporation The minimum size sample test specimen is - Answer ️️ -28 L (1ft^3) when sampling from a stationary mixer the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch - Answer ️️ -2 The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge - Answer ️️ -5 When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of ______ regularly spaced intervals during discharge of the middle portion of the batch - Answer ️️ -2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site - Answer ️️ -False The composite sample from a truck mixer must be obtained from the _____ portion of the batch - Answer ️️ -Middle